Why the unrotated projectile was a failed ship weapon

What was one of the worst weapons a navy tried to use aboard ship?

The Royal Navy's unrotated projectile, an ineffective anti-aircraft rocket system that occupied valuable deck space.

The rocket system was intended to disrupt formations of heavy bombers attacking ships, but its unguided projectiles proved ineffective. The concept was poorly matched to the threat. Implementation failed to rescue it, and political enthusiasm still pushed launchers onto valuable positions aboard ships such as Nelson and Rodney. The episode shows how patronage can carry a weak weapon through procurement despite technical objections.